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Long-term Debt EETCs (Details)
$ in Millions
1 Months Ended
Aug. 31, 2015
trust
Sep. 30, 2015
USD ($)
aircraft
2015-2016 [Member]    
Debt Instrument [Line Items]    
Number of aircraft with secured debt financing commitments scheduled for delivery   15
Airbus [Member] | 2015-2016 [Member]    
Debt Instrument [Line Items]    
Number of aircraft with secured debt financing commitments scheduled for delivery   15
Airbus [Member] | A321 [Member]    
Debt Instrument [Line Items]    
Number of aircraft with secured debt financing commitments scheduled for delivery   12
Airbus [Member] | A320 [Member]    
Debt Instrument [Line Items]    
Number of aircraft with secured debt financing commitments scheduled for delivery   3
Enhanced Equipment Trust Certificate [Member]    
Debt Instrument [Line Items]    
Debt instruments, blended interest rate   4.15%
Enhanced Equipment Trust Certificate [Member] | Capital Addition Purchase Commitments [Member]    
Debt Instrument [Line Items]    
Number of pass-through trusts | trust 2  
Debt financing commitments | $   $ 576.6
A320 [Domain] | Enhanced Equipment Trust Certificate [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage   4.10%
Equipment Notes, Series B [Member] | Enhanced Equipment Trust Certificate [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage   4.45%